<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>表单</title>
</head>
<body>
https://www.baidu.com/s?wd=156456
<form name="baidu" action="https://www.baidu.com/s?" method="get">
    <input type="text" name="wd" placeholder="请输入关键词"/>
    <input type="submit" value="百度一下">
</form>
</body>
</html>